GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN-48245 Camshaft Locking Tool
    • EN-48946 Crankshaft Locking Tool

For equivalent regional tools, refer to Special Tools.


    Object Number: 2027461  Size: SH
  1. Remove the wiring harness plug (2).
  2. Remove 4 wiring harness clips (1) from the bracket (3).

  3. Object Number: 2027459  Size: SH
  4. Remove the 2 (2) nuts from the wiring harness bracket (1).
  5. Remove the wiring harness bracket (1).

  6. Object Number: 2027460  Size: SH
  7. Remove the 4 vacuum pump bolts (2).
  8. Remove the vacuum pump (1).
  9. Remove the vacuum pump gasket (3).

  10. Object Number: 2027173  Size: SH
  11. Rotate the crankshaft to the markings at the crankshaft sprocket and oil pump cover.

  12. Object Number: 2027172  Size: SH

    Note: 

       • Examine that the bore (1) in the camshaft (2) is on top.
       • Examine the correct positions of the camshaft and the crankshaft.

  13. Rotate the camshaft (1) to the shown position.
  14. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 2027175  Size: SH

    Note: If the timing marks are not aligned, repeat the forward procedure and recheck the marks. Alignment of marks is critical for engine performance and emissions.

  15. Install the EN-48946 locking tool  (1) to fix the camshaft and install the bolts (2) and tighten to  11 N·m (98 ft in).
  16. Remove the lower crankcase closure bolt (5).
  17. Install EN-48245 locking tool  (4) into the lower crankcase hole (3). Turn the crankshaft to TDC until the tool engages in the crankshaft.

  18. Object Number: 2027175  Size: SH
  19. Remove the EN -48946 locking tool  (1) and remove the bolts (2). Remove EN-48245 locking tool  (4) from the lower crankcase hole (3). Install the lower crankcase closure bolt (5) and tighten to  30 N·m (23 lb ft).
  20. If the timing marks are not aligned. Refer to Timing Belt Removal and Timing Belt Installation. Alignment of marks is important for engine performance and emissions.